Packing for pumps



Dec. 22, 1925- H. M. s uNNEs PACKING FOR PUMPS Filed Jan. 2, 1925 .Patented Dec. 22, 1925.

UNITED STATES HENRY M. sUNNEs, or CHICAGO, ILLINOIS'.

PACKING lion PUMPS.

Application filed January 2, 1925. Serial No. 17.

To all whom t may concern:

Be it known that I, HENRY M. SUNNES, a citizen of the United Statesi of America, and a resident of'Chicago, inthe county of Cook and State of Illinois, have invented certain new and useful Improvements in Packing for Pumps, set forth in the following specification.

My invention relates to packing for pumps, and more particularlyv to packing for pumps of the oscillating piston type. The object is to provide a superior form of packing for the wings of the piston, and for the hub or cylindrical portion between the wings.

' In the accompanying drawings Fig. 1 is an elevation of a pump with the front cover removed; f

F 2 is an enlarged elevation of `the piston;

Fig. 3 is a section on line 3-3 of Fig. 2;

Fig. 4 is a perspective view of one of the packing strips;

Fig. 5 is a similar view of one of the springs which act on the packing strips; and

Fig. 6 is a still more enlarged perspective view of the ends of the packing strips 4where they form corner joints.

The pump body 10 is a cylindrical casingV having valve-holding blocks 11 and 12. The apexes of these blocks are bored out to receive the hub 13, on the opposite sides of which hub are wings 14 and 15 made to it the inner surface of the casing 10.

In those parts of the blocks 11 and 12 which come in Contact with the hub 13, I ,cut grooves or slots for receiving packing strips 16, and leaf springs 17 which force said strips against the surface of the hub 13. In the front and rear edges of wings 14 and 15 I cut grooves to receive strips 18 with their springs 17, and into the outer edges of the wings I cut other grooves t0 receive strips 19 and their springs 17.

Each of the strips 16, 18 and 19 has a central bulge 20 on its inner edge, and a slot 21 extending thru that bulge. The strips 16 are flat pieces of brass, bronze or other suitable material, and the strips 18 and 19 are of similar character except that, at the corners where they meet, they have tongue and groove ends as shown in Fig. 6.

The grooves or slots in the blocks 11 and 12, and in the wings 14 and 15, for receiving these strips, have central depressions or recesses 22 into which the bulges 20 project. Ihe springs 17v have central bends 23 which ,extendv into'these Vrecesses and clear the bulges 20. The springs are given an initial tension so that they press the packingstrips outward' by the ends of the springs engaging the inner faces of the strips. The

:springs are so constructed that they bear on The pin 25 is infact a rivet with a small head. After it has been passed thru the slot21 to retain the strip in its groove, the other end is upset to prevent the rivet from falling out. As so constructed, the pins or rivets 25 retain the ypacking strips in their grooves, but do not interfere with the springs causing the outer edges of the strips bearing uniformly against the surface where it is desired to prevent leaks.

To retain these packing strips in place when the pump is being assembled, there must be pins 25 or their equivalent. 'Io compensate for wear, there must be slots 21 to permit outward movement of the strips under the action of the springs. To avoid making the strips heavy, those slots must pass thru bulges 20, thus leaving the remaining part of the strips thin and light. vThis calls for recesses 22. By making the springs of the shape shown in Figs. 3 and 5, these recesses and the inner faces of the strips hold the springs from displacement without the application of special holding devices.

IVhat I claim is:

1. In a piston packing in which the line of contact between the moving and stationary surfaces is a straight line, a groove in one of the surfaces, said groove having a recess at one portion, a strip located within the groove and having a bulge projecting into said recess, and a spring located in the groove under the strip, said spring being retained from longitudinal displacement by a portion thereof projecting into said recess.

2. In a pump, an oscillating pistorn having grooves in its edges and a recess at the bottom of each groove, s metallic packing llH strip located in each groove, means for retaining the strips from displacement in their grooves when the piston is removed from the pump, and a leaf spring located in each groove under each strip, each spring being retained from longitudinal displacement in its groove by a portion thereof projecting into the adjacent recess.

3. In a pump, an oscillating piston having grooves in its edges, a metallic packing strip located in each groove, a pin for each strip supported in the body of the piston and passing thru a slot in the strip so as to permit the strip to be moved in its groove Without being displaced therefrom, and a spring located in each groove and pressing outward on its associated strip.

4E. In a pump, an oscillating piston of rectangular form and provided with a groove in each of its edges, a metallic pack ing strip located in each groove, means for permitting outward adjustment of each strip in its groove While at the same time retaining the strip from displacement When the piston is removed from the pump, and a spring located in each groove and pressing outward on .its associated strip.

HENRY M. SUNNES. 

